If you change from HDD mode from ESRT2 to AHCI or Enhanced in BIOS, you'll need to reboot the system to get correct HDD size. In my case AHCI mode doesn't display HDD size in BIOS, but OS can see the entire HDD size.
If you're using ESRT2, you can't install OS to a disk larger than 2TB. Install OS first on a HDD less than 2TB, and then initialize the large drive.
As for RST, you need to enable RST mode in BIOS before you can install RST driver/utility.